#include "mystdio.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>

static MyFile* BuyFile(int fd,int flag)
{
    MyFile* f = (MyFile*)malloc(sizeof(MyFile));
    if(f==NULL)
    {
        return NULL;
    }
    f->bufferlen = 0;
    f->fileno = fd;
    f->flag = flag;
    f->flush_method = LINE_FLUSH;
    memset(f->outbuffer,0,sizeof(f->outbuffer));
    return f;
}

MyFile* MyFopen(const char* path,const char* mode)
{
     int fd = -1;
     int flag = 0;
     if(strcmp(mode,"w") == 0)
     {
        flag = O_CREAT | O_WRONLY | O_TRUNC;
        fd = open(path,flag,0666);
     }
     else if(strcmp(mode,"a") == 0)
     {
        flag = O_CREAT | O_WRONLY | O_APPEND;
        fd = open(path,flag,0666);
        
     }
     else if(strcmp(mode,"r") == 0)
     {
        flag = O_RDWR;
        fd = open(path,flag,0666);
        
     }
     //else(strcmp() == 0)
     //{
        //TODO
     //}
     
     if(fd<0) return NULL;

     MyFile* f = BuyFile(fd,flag);
     return f;
}
void MyFclose(MyFile*)
{
    if(file->fileno<0) return;
    MyFFlush(file);
    close(file->fileno);
    free(file);
}
int MyFwrite(MyFile*file,void* str,int len)
{
    //拷贝
    memcpy(file->outbuffer+file->bufferlen,str,len);
    file->bufferlen += len;
    //2.尝试判断是否满足刷新条件
    if((file->flush_method & LINE_FLUSH) && file->outbuffer[file->bufferlen-1] == '\n');
    {
        MyFFlush(file);
    }
    return 0;
}
void MyFFlush(MyFile* file)
{
    int n = write(file->fileno,file->outbuffer,file->bufferlen);
    (void)n;
    file->bufferlen = 0;
}
